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Analog Devices Semiconductor Electronic Components Datasheet



AD1555

24-Bit ADC WITH LOW NOISE PGA


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AD1555 pdf
a
24-Bit -ADC
with Low Noise PGA
AD1555/AD1556
FEATURES
AD1555
Fourth Order -Modulator
Large Dynamic Range
116 dB Min, 120 dB Typical @ 1 ms
117 dB Typical @ 0.5 ms
Low Input Noise: 80 nV rms @ 4 ms with
Gain of 34,128
Low Distortion: –111 dB Max, –120 dB Typical
Low Intermodulation: 122 dB
Sampling Rate at 256 kSPS
Very High Jitter Tolerance
No External Antialias Filter Required
Programmable Gain Front End
Input Range: ؎2.25 V
Robust Inputs
Gain Settings: 1, 2.5, 8.5, 34, 128
Common-Mode Rejection (DC to 1 kHz)
93 dB Min, 101 dB Typical @ Gain of 1
77 mW Typical Low Power Dissipation
Standby Modes
AD1556
FIR Digital Filter/Decimator
Serial or Parallel Selection of Configuration
Output Word Rates: 250 SPS to 16 kSPS
6.2 mW Typ Low Power Dissipation
70 W in Standby Mode
Reference Design and Evaluation Board with
Software Available
APPLICATIONS
Seismic Data Acquisition Systems
Chromatography
Automatic Test Equipment
GENERAL DESCRIPTION
The AD1555 is a complete sigma-delta modulator, combined
with a programmable gain amplifier intended for low frequency,
high dynamic range measurement applications. The AD1555
outputs a ones-density bitstream proportional to the analog
input. When used in conjunction with the AD1556 digital filter/
decimator, a high performance ADC is realized.
The continuous-time analog modulator input architecture avoids
the need for an external antialias filter. The programmable gain
front end simplifies system design, extends the dynamic range,
and reduces the system board area. Low operating power and
standby modes makes the AD1555 ideal for remote battery-pow-
ered data acquisition systems.
The AD1555 is fabricated on Analog Devices’ BiCMOS process
that has high performance bipolar devices along with CMOS
transistors. The AD1555 and AD1556 are packaged, respectively,
in 28-lead PLCC and 44-lead MQFP packages and are specified
from –55°C to +85°C (AD1556 and AD1555 B Grade) and from
0°C to 85°C (AD1555 A Grade).
0
–20
–40
–60
–80
–100
fIN = 24.4Hz
SNR = 116.7dB
THD = –120.6dB
–120
–140
–160
–180
–200
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY – Hz
Figure 1. FFT Plot, Full-Scale AIN Input, Gain of 1
FUNCTIONAL BLOCK DIAGRAM
AIN (+)
AIN (–)
TIN (+)
TIN (–)
REFIN REFCAP2 REFCAP1 AGND3
REF DIVIDER
DAC
MODE CONTROL
LOGIC
OVERVOLTAGE
DETECTION
PGA
MUX
LOOP
FILTER
AD1555
CLOCK
GENERATION
CB0...CB4
MFLG
CSEL
TDATA
MDATA
MCLK
PGA0...PGA4 H/S
ERROR
PGA
CONTROL
CONFIGURATION
REGISTER
INPUT SHIFT
REGISTER
STATUS
REGISTER
INPUT
MUX
DIGITAL
FILTER
DATA
OUTPUT
MUX
CLOCK DIVIDER
DATA
REGISTER
AD1556
DIN
SCLK
CS
R/W
DOUT
DRDY
RSEL
AGND1
REV. B
PGAOUT MODIN AGND2 +VA –VA
VL DGND
CLKIN SYNC BW0...BW2 RESET PWRDN GND VL
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002



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AD1555 pdf
AD1555/AD1556
AD1555–SPECIFICATIONS (+VA = +5 V; –VA = –5 V; VL = 5 V; AGND = DGND = 0 V; MCLK = 256 kHz; TA = TMIN to
TMAX, unless otherwise noted.)
Parameter
Notes
AD1555BP
Min Typ Max
AD1555AP
Min Typ Max
Unit
PGA Gain Settings
1, 2.5, 8.5, 34, 128
AC ACCURACY
Dynamic Range1
Total Harmonic Distortion2
Jitter Tolerance3
Intermodulation Distortion4
PGA Gain of 1
PGA Gain of 2.5
PGA Gain of 8.5
PGA Gain of 34
PGA Gain of 128
PGA Gain of 1
PGA Gain of 2.5
PGA Gain of 8.5
PGA Gain of 34
PGA Gain of 128
PGA Gain of 1
116.5
116
114
104.5
120
119.5
117.5
109.5
98
–120
–116
–116
–115
–108
122
–111
–108
–106
–101
300
116
115.5
114
104.5
120
119.5
117.5
109.5
98
–120
–116
–116
–115
–108
122
–107
–107
–105
–101
300
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
ps
dB
DC ACCURACY
Absolute Gain Error5
Gain Stability Over Temperature5
Offset5, 6
Offset Drift5, 6
PGA Gain of 1, 2.5
PGA Gain of 8.5
PGA Gain of 34
All PGA Gain
–3.5 +3.5
–4.5 +4.5
–10 +10
± 15
–60
6
–3.5 +3.5
–4.5 +4.5
–10 +10
± 15
–60
6
%
%
%
ppm/°C
mV
µV/°C
ANALOG INPUT
Full-Scale Nondifferential Input
Input Impedance
Full-Scale Differential Input
Differential Input Impedance
Common-Mode Range
Common-Mode Rejection Ratio
Power Supply Rejection Ratio7
AIN to TIN Crosstalk Isolation
Differential Input Current
MODIN
MODIN
PGA Gain of 1
Other PGA Gain Settings
AIN, TIN Inputs
VCM = ± 2.25 V, fIN = 200 Hz
PGA Gain of 1
PGA Gain of 2.5
PGA Gain of 8.5, 34
PGA Gain of 128
fIN = 200 Hz
± 2.25
20
± 2.25
See Table I
140
± 2.25
93 101
95 102
95.5 108
108
50
130
130
± 2.25
20
± 2.25
See Table I
140
± 2.25
91 101
91.5 102
94.5 108
108
50
130
130
V
k
V
M
V
dB
dB
dB
dB
dB
dB
nA
TEMPERATURE RANGE8
Specified Performance
REFERENCE INPUT9
Input Voltage Range
Input Current
TMIN to TMAX
–55 +85 0
85
2.990 3.0
130
3.010
2.990 3.0
130
3.010
°C
V
µA
DIGITAL INPUTS OUTPUTS
VIL
VIH
IIL
IIH
VOL
VOH
ISINK = +2 mA
ISOURCE = –2 mA
–0.3 +0.8 –0.3 +0.8 V
2.0 VL + 0.3 2.0 VL + 0.3 V
–10 +10 –10 +10 µA
–10 +10 –10 +10 µA
0.4 0.4 V
2.4 2.4
V
–2– REV. B



Part Number AD1555
Description 24-Bit ADC WITH LOW NOISE PGA
Maker Analog Devices - Analog Devices
Total Page 24 Pages
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